Bucksaw



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J.,F. FRENCH.

BUGKSAW.

No. 375,061. Patented 1500.20, 1887.

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BUGKSAW. d No. 375,061. Patented Dec. 20, 1887.-

wlTNEssEs l INVENTQRIUZ, @fw-5% 7 QA/W7 UNITED STATES PATENT OFFICE.

JOSIAH F. FRENCH, OF PHILADELPHIA, PENNSYLVANIA.

BUCKSAW.

SPECIFICATION forming part of Letters Patent No. 375,061. dated Deember20, 1887.

Application filed March 8, 1887.

To all whom, it' may concern:

Be it known that I, JosIAH F. FRENCH, of the city and county ofPhiladelphia, State of Pennsylvania, have invented a new and usefulImprovement in Bucksaws, of which the following is a true and exactdescription, reference being had to the drawings which accompany andform a part of this specification, and wherein- Figure 1 represents abucksaw embodying my invention, and Figs. 2 and 3 represent side viewsofthe blade thereof.

Similar letters of reference indicate similar parts in the severalviews.

The bucksaw is composed of a saw-blade,

' A, having teeth a, the teeth of the said sawblade being cut in such amanner or upon such a surface that their crowns form a concave curve. Bythis means when the center tooth bites the article to be sawed the otherteeth lying within the line of the said tooth will also bite the articleto a greater depth, proportioned to the distance which they projectbeyond the horizontal line drawn through the center tooth. It will thusbe seen that the power which is to a greater or less extent lost at theend of the inward and outward throw of the ordinary bucksawI is, bymeans of my Serial No. 230,157. (No model.)

invention, fully utilized. The outside edge of the saw-blade being inthe form of a convex curve, as indicated, I am enabled to have the teethlie in the desired concave line without weakening the blade.

My improved saw is provided with the sawrame B and the tightening deviceC, the blade being united to the frame by suitable rivets orretainingpins, D D. In the saw as thus constructed the line of strain intightening the frame will be that represented by a line joining therivets D D, and will therefore be very close to the teeth, andconsequently holding the blade at its point of greatest strain withgreat rigidity.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

A bucksaw consisting of a frame, B, a tightening device, C, and asawblade, A, the teeth of which lie in a concave curve and the back in aconvex curve, said blade being connected with the frame by rivets orpins D, located in a line near the saw-teeth.

JOSIAH F. FRENCH.

Vitnesses:

WALTER T. BILYEU, FRANK OROWNE.

